Rydygier informed us he released a new version of his "Fire At Will" addon on the BI forums.
This addon creates functional AI artillery for people who wish to use such in their missions but lack any scripting knowledge.
Since version 1.3 this comes in an Arma 2 Standalone and an Arma 2: Combined operations version! The old Arma 2 version can be downloaded from here: "Fire At Will" - Functional AI artillery v1.2 hotfix.

Quote Rydygier :Purpose of the "Fire At Will" addon is to give in simplest way possible fully functional AI artillery to battlefield for those, who can't or simply refuse to learn script language but still want functional AI artillery in his Arma 2 missions. It was created because in my opinion it is illogical to force a player to learn script language and to study BIS_ARTY Module commands and variables even if he wants just to set up some AI artillery in his missions, while such knowledge is not required for any other types of AI combat units, which are fully functional without any scripting.